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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c47a1fb25281d8c3e33b3aff6064be5a2f2c032b39c58041dbcb9ab135834cbf' 
  AND token = 'PFf8EGEkbnleD6LVef9XAR1IcgSptbQqy9pQTpdJEaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}