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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d0668b03235fe9a58fdbe9f4023526cde4536edcbf99b2902c7d85e58d89c16' 
  AND token = 'UcoOcHYR9iSuIcEz6ZCjb05fPEnw5upC6mapjacRx/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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