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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '852f2cfac5808201dbb001b198bffa0e3d04635a7ffeb62f74e5ada88767fd26' 
  AND token = '41CuRueQ/LqnHACEYELhXYsI7VCF6YHsOZxF0pMThpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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