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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e9e790b08ce5e0fbede295e9fc13414a5f718ad9596af5965f2f03fa2e1f312' 
  AND token = 'IpvzSO9/VjkLinnyU2vznSXu7aINBozVH65jzSKCne4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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