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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fc4945a815d71d667526ad39b1fc991d0b84698861975a8eae7835fe5ddd9b1' 
  AND token = '36pPPIHQXk8hWtL6e7msGagaDNTe5WSq7sBACqMYgIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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