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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7eba09e7fcf175fc6a1d0e003e76c9fc8ec9f63d386c3b2fe3a6921ebc5edd1' 
  AND token = 'lpDVC15QQYzk7bwiolQC6XjAgd+LJifM5GXskoq85h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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