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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '284cf20d7822d2227c993f3f778a2bb5e391945bd16a9f9035e0d9f7f6a677a5' 
  AND token = 'yWtrxrTxxXZK9c4s42rYBKWk5X/keEPBct/4ZK07MdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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