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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8814dddbb32c9fb2122df121480c574d66224135cb22250d0327c68f481db230' 
  AND token = '2spNEBs71WAl4tB/WyCt88uSaoLDd10UVPEl79IPEXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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