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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e95903a117fe14520829dd92b9be372584d90605a4142cccf52f211ec88a15da' 
  AND token = 'j9fkDKVMXGCCGTDW5npyd2/PhmrnmUYmrdw40F+CDjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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