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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13a3e838b7ad921a17b660b5cacb61fe62bb196b2463b5bd3b7f62d5a0a94666' 
  AND token = 'yRIu6EHuCg7MqyPbyPL5y2xolGUPEF5VkC1Nwc6LfPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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