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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f53dcf7ea0dfbad32299f439eca0877c6730973a3c9a20892060793cd9bf1d3f' 
  AND token = 'tbRUWdXWIcyB7wtW8BZovQ4BITjPGhjC4OBGnSljTOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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