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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43991fc81c4b958f94256a59141659f588115b3d9afc27b59a8df3fc6f0d4546' 
  AND token = '9CUAkZP4a6bn0Q7412PDLn4zLnjdyyNdZ83NYEdmrJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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