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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc3c7cfc77c4b54a8adc39e2bc93f23eec912afe49b254b0bd3673665a798a09' 
  AND token = 'sfk3m7mVDReaObYi96mgw+RUjDkF/oQgzDtQDRWnoo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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