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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e524cce7a97008c21fd8adc30555d4a55cbc97e30b2a0122b4ee2bd0a0b15428' 
  AND token = 'qtA8SthDO4VIL2Ta+i8FXDqA+XF2+8SlPgMmR9BeGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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