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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d51f360cd2af69e89685259f5fc791bf88dd5c6ee3fb8ee798482cb2d0380d9' 
  AND token = 'FD/7Be0Q5NEmDktsQso9QeXZRvpnwgtER+C2vd/HP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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