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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7657661a98d7ab2bbe01744251271db28dae01d7beb0069f8d950dac7aba3ad2' 
  AND token = 'umwmCTyTlEwIiHgCMb/kF+wuCXZz6pypVYt699eF9r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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