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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8c3e6dc6a2e922cd31811d92b11b9346f1de5cf676c72a0427fcdc79faab68a' 
  AND token = 'EDuBbMOS/Rr0nXBfZa/UrGITFF+/Nc6ZTMFpCIjRQ8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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