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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838a4a09c67eada1682b00e9044999b5750e478c1a15776c331623329191b4c8' 
  AND token = 'MlkX+nJtbD34ADHKYPQO8erUX8BX6rngMivI/gAFW2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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