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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15e880de49f5519744ce039dfe52eee2e9a9cc1203473e8dbabe45671c07cab0' 
  AND token = '9HMz6gYgPSalxxEp6AMytG4l7pAzQPNdWoZpjbCEpgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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