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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04cad2e1526ca0b9358d188ec8e49ef94c8036faf6496a8a97c22be06000a870' 
  AND token = '7Qp8zjBDzxO0jayXvg/AQaDe7cq7V6O46m/frlA+7BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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