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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb3ac803ddd8a63e9ecc48f853989babc04442b07c044f8fa56f5b063affa3e4' 
  AND token = 'SadIIcgDP41d2AHmtXRuhv3mbq+xWFXmz/QwTzaIC/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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