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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8493aafe0b845446133b63efde307ea03766cc732fa3fc26f14dcea34334b551' 
  AND token = 'AyxUGe4aIpFS9FqzYAVhaancQ0Z9RoH4gFGip+oR+W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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