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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a27ef34d9204f0444d6f7ddf0a8f13af9e2dd34e8e635e7c6ddd3b5d51cf5919' 
  AND token = '42Vb+byDykoQ6wmje1S486haIh//fYeBsGatYQUW2r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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