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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4db26ec321083bd45e070eb1ef692a2248c46e10e633ac2f912bcc55d6e2703' 
  AND token = 'tr88jNOAqHd/dHab8OdDXNi0qO+qWFI2k+wIlmPHBIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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