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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd853f03bfc9694016bda5325eabbe696cf39f8e2800bf3cb7e0be7576ce83a23' 
  AND token = 'Jak85Os4r7a4lIq6ob4s31ByhDFW1LXcKkndwzAZUNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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