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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d9cf79b5996fce9b2ee85aa4001a5d14375ebe45a625ac1f3e16ecde8d79f8' 
  AND token = '/0G95G8gLgf2XLUyFtpUrlnRAJzftWRTrp+4Co4P1Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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