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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8fd9b085bf7b718ffd09d8f367a25f3ea06aba13588c08bd5d3b82c006dbd77' 
  AND token = 'Piqwkmoa80xEt5VK46VhdmCuuIFS7PU5z9yNSvIOIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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