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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8c511e6431c006895a53e0f1921a668cbf0e3cc64a4e75146bb02cde9331b3f' 
  AND token = 'usaA8P7Cd67emiF7xeHeDP7jRCfYwcx+cDbBXG9J+Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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