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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ed3045540c5dfbf191efbb4c58b8eb4819e17b6def8db08cc5045243ff246e' 
  AND token = 'FmgxkLYw4O3JtdKuYzqF0I5y1SYsSoQto3aMiEnPpOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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