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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b59e2dc7820ac129e980a341e6a00b1353abc29d3cb116aaca38e76c10b9a52' 
  AND token = 'saxBDufVyekfXKWJg8/9/7e9z4Y5YKsEuBmUDCQeOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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