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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ecb36e29301a365cf9acea96b04ffbd3957990bdc2d44f6e60015d10f599e85' 
  AND token = 'Ws6hx8zwRDJhNhcUL/KG+c16y/T07Pe014x3JGXxq20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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