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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5ebd58b30ca28ca97d6904c1b91b988b58552fb50453019f18d3bbc4b758d83' 
  AND token = '/xdyV9IGHhDnpXC2BnXHkpYPNSxIaHIJsB19B80Fjns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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