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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c510b7912ae57e76b5960552f2873df12d87ac593ec635bc68cdf3357c0bb015' 
  AND token = 'uWmYOro9N6I8HqOMcMix96A4A8OTK6g+NoJOj3E1rY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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