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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f647e5f393e0bf353bf13abbf1c27024f54c22563febc61c24bbf8c8196b2cd' 
  AND token = 'miJ1n3ISVo6RuZFUAy3EOlHA40fB/DZRFiVnloR5qkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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