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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd547f68778e6b2363b256be1b955d86ea33a7f1148dba0e9f6092f404958366c' 
  AND token = 'YFq0TYPNI3vdehWk9j6x7gR/nObLdLeybygIEOLAqWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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