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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26975d5e7beb57aed9065bf229fb9687f9b58059f9d4d7d3072d3db30b62d1d8' 
  AND token = 'AtmqBIWLb8rNEYB4THt2WuqvKYQsEfmnu1aqQJbMQOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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