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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f95f64513cbc67e579e13a64a1ad65da6962839132120634f6a540a2a8f1e3e' 
  AND token = '97rQuQkXppogu88jJD6gPUaH4x2hsZO5J4dfaCqBHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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