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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a37eca43941916b91cce95082422124a8fd07c97490cafabc894bd72900ca5be' 
  AND token = 'KRCVCxaHfy8iOhM5k22ilDBIuXyf5yQuFpBEf25J3lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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