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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c56406a443256490beaa7de3c465c5ef14ef56871d6b2fe2582eac1f00f70a2' 
  AND token = 'AM43heh0BmJW1rY/zeQnJ3FR1AB9geCuHAWnRAL4U9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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