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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebae23ef8f93f24a7d0e655e85afec5be951f5206e22cf973861b7d6827c3b10' 
  AND token = '4PDaJItJVMmekxu2v6CNDW36LKXEIV03hAsY3GwFILI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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