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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab85728b29a982869f0225feff995cf2e9aa5a5a41e3596e5841fd15284dbcba' 
  AND token = 'MJM5KpC+Tu6M0WZKkHpu6kuY+a/KmTpVF1vl+0+4Sdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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