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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93cfbf970247f78e94adafbeaa4b8eee9f47be02e9fe05ffbedef753d8c48b3c' 
  AND token = 'ghQhqOzKsg6MQwvikSgY1ZYrlrc/64OEKAGUovMWxMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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