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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e2942593953138a2ad382a0d0222d78d1fb21812a56342d0c1e5beac298e687' 
  AND token = 'zfu+tx2dFDSg4QIYtdd2tzENxY5bXrbA0cG9+6TCBTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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