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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b24cb7813dacd074056cba594c7eec61177f1ac32c53e26871cbc14f0c881d62' 
  AND token = 'i2qgVV5BvV0mTdS4lOhF08EC5BUbfehMTnm8PJVHYiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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