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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '820176b6e2783eefc991b3777593e2345e5c677cd07f6313faab6e2d90e9ea31' 
  AND token = 'P6y8eAFmwEPhRlagl5xAW+ZKcO5iOChJFWxgDQTH1F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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