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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e9db7956d3e4fcacb1027747f1e5557aeb371d4a3d62edd27dd77bef0a3febc' 
  AND token = 'wiuGzqiAedaENkjy9CmzbjsoHtxHMGKXr7Diy1f4nTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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