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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6476dd67d95b5306dda44f6b7dfac9fccf53a50ec3508bd2c40b0b82e98afb15' 
  AND token = 'AUQL0jQ71fLbhaES08epIfKbQ8puzivrM4pEVdB09Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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