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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8932083269b40bf0e72749ccdbbf6ebd83f67e4cd08c2ba2b78d083b47d95489' 
  AND token = 'HxVkt6Taql2vCzmj83DvI83vpu2r6SjPOSC5Ap+gXAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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