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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a2ce009aaecd120eb8048489dfcee63e04826de3eeb22acdf71d42f7c0bdf8' 
  AND token = 'ifd95qMqx7+ngzOmzUEFcOcQdjkzS89nhnOjKR296wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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