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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '600b977871bc0bac176ee9a97a6355daf4264e6070aa7d43467ea869d2e8d18d' 
  AND token = 'rqYZ0TOIulAQJS3WtcVi+Jw6hbiy7DtspINaMcB+Gvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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