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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c13099e3cf1c5ffc648366fc151f88f8f33bd65081634cf132bfcf9b3da545' 
  AND token = 'IHaywesLe6ZIV/FpuIwqkDzvDrAVp4fQHfawM0+nYOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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