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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd43ea97aebdb00273bea2c253283653a63b7f94a436ed179e8dcb1d944d9101f' 
  AND token = '1j5smn1axOeHRP63pL9k4Z/eOJ4/rnyuavad0wQbN4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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