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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b14d6e5b1f11d92d180a717f7a55cdd4c3a1faed9927a156db4a1c4f391824cb' 
  AND token = 'PM7g9ONOPNHr8hCufDbuTJEUnBksWMhjZtM1KVen+Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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