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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b215ab58058a9325053848990deceecee0acdc2dbf97826e27396580be44c4b9' 
  AND token = 'srqShES3/9xWaOnoc3smw5LCygZuX3QMnPcR/iwKpj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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